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Merry Antralina
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Journal : Jurnal Sains Teh dan Kina

 1 
Influence of biological control agents Helicoverpa armigera nuclear polyhedrosis virus (HaNPV) on mortality twig caterpillar (Ectropis bhurmitra Wlk.) Joko Santoso; Merry Antralina
Jurnal Penelitian Teh dan Kina Vol 14 No 2 (2011)
Publisher : Research Institute for Tea and Cinchona

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22302/pptk.jur.jptk.v14i2.9

Abstract

The objective of this research was evaluate effectiveness of Helicoverpa armigera Nuclear Virus Polyhedrosis virus (HaNPV) on twig caterpillar (Ectropis bhurmitra Wlk) mortality. The experiment was conducted at the Research Institute for Tea and Cinchona, Gambung, Bandung, elevation of + 1.300 m asl, from March 2011 till June of 2011. A completely randomized design was used with 12 treatments and replicated twice. Aplication of four level concentrations of HaNPV on three stadia of the twig caterpillar larvae were performed. The HaNPV concentrations were 4 x 106 PIB/mI, 4 x 104 PIB/ml, 4 x 102 PIB/ml and 0 PIB/ml, and stadia of the twig caterpillar larvae were 2, 3, and 4. The results indicated that direct application of HaNPV on twig caterpillar larvae had similar effect in mortality of the larvae, either in the laboratorium or in the greenhouse, with level of mortality was 70% within four to ten days periode. Laboratory expe­rimentation indicated that 4 x 102 PIB/ml concentration of HaNPV applied directly on stadia 3 and 4 was effective in suppressing Ectropis bhurmitra Wlk. larva population while for larvae stadium 2 the effective concentration was 4 x 104 PIB/ml. In greenhouse experiment revealed that 4 x 102 PIB/ml concentration of HaNPV was effective in suppressing larvae of stadium 2 and stadium 4, while until the end of the experiment no indication of maksimum mortality in stadium 3 population.
The Influence of biofertilizer on abundance of Nitrogen Fixing bacteria and growth of Chinchona Plants (Chinchona ledreriana.) Clone Cib. 5 Merry Antralina; Joko Santoso; Dewi Kania
Jurnal Penelitian Teh dan Kina Vol 18 No 2 (2015)
Publisher : Research Institute for Tea and Cinchona

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22302/pptk.jur.jptk.v18i2.57

Abstract

The objective of this research was to eva-luate the effect of biofertilizer on the abundance of nitrogen fixing bacteria and growth of cin-chona plants (Cinchona ledgeriana Moens) clones Cib.5. The research was conducted at the Research Institute for Tea and Cinchona, Gambung, Bandung, from May 2011 until June 2011. A randomized block design was used with five treatments and five replication. Application of five concentration of biofertilizer were per-formed. Concentrations were: 0, 2, 4, 6, and 8 cc/l of water. The results indicated that the application of biofertilizer gave the higher total bacterial population compared to the treatment without biofertilizer, but showed no significant effect on growth of Cinchona plants. Concen-tration of biofertilizer 8 cc/l gave the higher total bacterial population of nitrogen fixing.
Influence of biological control agents Helicoverpa armigera Nuclear Polyhedrosis Virus (HaNPV) on intensity of the attack twig caterpillar (Ectropis bhurmitra Wlk) and yield of tea plant (Camellia sinensis (L.) O. Kuntze) clone GMB 7 Merry Antralina; Joko Santoso
Jurnal Penelitian Teh dan Kina Vol 18 No 1 (2015)
Publisher : Research Institute for Tea and Cinchona

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22302/pptk.jur.jptk.v18i1.62

Abstract

The objective of this research was to evaluate the effect of Helicoverpa armigera Nuclear Polyhedrosis Virus (HaNPV) on attack intensity of twig caterpillar (Ectropis bhurmitra Wlk) and the yield of clone Gambung 7 tea plant. The research was conducted at the Research Institute for Tea and Cinchona, Gambung, Bandung, from May 2011 till June 2011. A  randomized block design was used with five treatments and replicated four replications. Application of five controls method for the twig caterpillar were performed. HaNPV at  4 x 106 PIB/mI, and 4 x 104 PIB/ml, Bacillus turingiensis (Thuricide) 1 g/L, Spinosad (Tracer 120 SC) 0,5 ml/L, and chemical insecticides (Electric 500 EC) 0,5 ml/L. The results indicated that HaNPV at both the density gave the same effect compare to other insecticides tested on the attack intensity of twig caterpillar as well as yield of tea plant clone Gambung 7.
Co-Authors Dewi Kania Joko Santoso Joko Santoso